Coffee maker



March 18, 1952 L. BURGESS COFFEE MAKER Original Filed July 12, 1947 10Sheets-Sheet l INVENTOR L. BURGESS COFFEE MAKER March 18, 1952 10Sheets-Sheet 2 Original Filed July 12, 1947 INVENTOR K Maw IIIIIIIII.

7 IIIIIIIIII I III/II March 18, 1952 L. BURGESS COFFEE MAKER OriginalFiled July 12, 1947 10 Sheets-Sheet 5 men INVENTOR L. BURGESS March 18,1952 COFFEE MAKER 1O Sheets-Sheet 4 Original Filed July 12, 1947fllllllllz R O T N E V W L. BURGESS March 18, 1952 COFFEE MAKER 10Sheets-Sheet 5 Original Filed July 12, 1947 E QN QVN wmN m NE mi @vNINVENT R.

March 18, 1952 L. BURGESS 2,539,335

COFFEE MAKER Original Filed July 12, 1947 10 Sheets- Sheet 6 March 18,1952 BURGESS COFFEE MAKER Original'Filed July 12, 1947 10 Sheets-Sheet'7 352 2ao l L 219 L 1 jl E 249 3800 Z40 I 3.30 335 368 ,9 37a 353 216 I22a g g I 362 L. BURGESS COFFEE MAKER March 18 1952 1o Sheets-Sheet 8Original Filed July 12, 1947 0 w J QJ 3 2 3 9m 3 5 3 1 w 3 5 7. 3 m 0 Mw .a o 3 1 M .n 3 5 H 6 4 3 3 3 3 3 0 3 4 0 3 2 5 5 u 3 3 3 2 OO 6 1 H 6I 0 H u INVENTOR M m March 18, 1952 1.. BURGESS 2,589,335

COFFEE MAKER I 7 Original Filed July 12, 1947 10 Sheets-Sheet 9 INVENTORMarch 18, 1952 1.. BURGESS 2,589,335

v COFFEE MAKER Original Filed July 12, 1947 10 Sheets-Sheet l0 PatentedMar. 18, 1952 UNITED STATES PATENT OFFICE 2 8235335 COFFEE MAKER LouisBurgess, Jersey City, N. J.

Original application Jilly 12, 1947, Serial No.

5 Claims. (Cl. 99-283) The present invention is an improvement upon thecoffee maker described in my U. S. Patent 2,149,270 of March 7, 1939 andis a division of my copendin application, Serial No. 760,599, filed Jul12, 1947.

The machine shown and described in my said prior patent in the completeform in which it is adapted for restaurant and similar use includes thefollowing:

A. A tank from which a predetermined amount of hot water is extractedwhenever the machine is operated. The water in this tank isautomatically maintained at a predetermined level by a float controlinlet valve and this water is automatically maintained at boilingtemperature by a thermostatically controlled heating device.

B. A dispenser which delivers a predetermined amount of ground roastedcoffee when the machine is operated.

C. A receptacle into which said coffee and said water are introduced andin which they are mixed.

D. An imperforate self-dumping overflow type centrifuge into which themixture of coffee and water flows from said receptacle and in which themixture is separated into a clarified coffee beverage which overflowsthe upper lip or rim of the centrifuge and a residue of coffee groundswhich is ejected from said centrifuge after said centrifuge has stopped.

E. A collector ring encircling the overflow lip or rim of the centrifugeby which the clarified coffee beverage is collected and from which it isconducted to a suitable receptacle.

F. An automatic timing device whereby the steps involved in theoperation of the machine are carried through in sequence whenever themachine is set in operation.

The improvements to this machine constituting the present invention willbe fully understood from the following description read in conjunctionwith the drawing in which:

Fig. 1 is a side elevation of my improved coffee maker, with certainparts in section;

Fig. 2 is a plan view thereof, with certain parts removed;

Fig. 3 is a cross-section through a detail of construction;

Fig. 4 is a vertical section along the plane IVIV of Fig. 1;

Fig. 5 is a vertical section along plane VV of Fig. 1;

Figs. 6, '7, 8 and 9 are various detail views of parts of theconstruction shown in Fig. 5;

Fig. 10 is a side View of a part of the construction shown in Fig. 5;

Fig. 11 is a plan view of, the showing of Fig. 10;

Fig. 12 is a broken cross-sectional view along plane XII-XII of Fig. 11;

Fig. 13 is a horizontal section along plane XIII--XI1I of Fig. 1;'

Fig. 14 is a partial sectional view along plane XIVXIV of Fig. 13;

Fig. 15 is a partial sectional view along plane XV-XV of Fig. 13;

Fig. 16 is a sectional view showing a detail of construction;

Fig. 17 is a view partly in diametral section of the dispenser shown inFig. 1;

Fig. 18 is a full bottom view of the showing of Fig. 1'7;

Fig. 19 is a perspective view of part of the showing of Fig. 17

Fig. 20 is a rear view of the timing device according to my invention;

Fig. 21 is a front view thereof;

Fig. 22 is a right side view thereof;

Fig. 23 is a left side view thereof;

Fig. 24 is a plan view of the timing device of Figs. 20 to 23, showingin addition certain other details of construction;

Fig. 25 is a vertical section along plane XXV-XXV of Fig. 1;

Figs. 26, 27, 28, 29, 30, 32 and 35 are detail views showingcorresponding positions of a number of cams which are part of the timingdevice shown in Figs. 20-24 inc.

Fig. 31 is a top View of part of the showing of Fig. 30;

Fig. 33 is a left side view of part of the showing of Fig. 32;

Fig. 34 is a detail view with certain parts removed of part of theshowing of Fig. 32.

Fig. 36 is a wiring diagram for my machine.

The parts of the machine are assembled on base I (Figs. 1, 2, 4 and 5)supported by suitable legs 2. Tank 3 is mounted on one end of this baseand comprises vertical shell 4 carrying at its upper edge flange 5 towhich cover 6 is detachably secured by screws. Water enters the tankthrough pipe [0 (Figs. 1 and 2) communicating with a water pressuresource (not shown in the drawing). Flow into the interior of the tank iscontrolled by needle valve I3 (Figs. 1, 2, 4 and 13) discharging intotube M. The operation of valve I3 is controlled by fioat l6 operatingthrough arm I8 and push rod 15 in such a manner that this valve isclosed when the level of water in the tank reaches a predetermined levelindicated by I! (Figs. 1 and 4). Water level gauge glass 19 (Fig.

.1) communicating at top with the open atmosphere provides convenientmeans to check this level. Whenever water is withdrawn from the tank,float |6 falls slightly, push rod is thereby raised and water flows intothe tank from tube |4 via pipe l0 until the predetermined level (I1) isreached. Chamber 2| is open at the bottom to receive heat from burner 22(Figs. 1 and 4) and at it top communicates with identical stacks 23 and24 (Figs. 1, 2, 4 and 13). The function of chamber 2| is to transfer theheat delivered by burner 22 to the water in the tank, while stacks 23and 24 carry off the gaseous combustion products of the burner. Burner22 receives gas through pipe 25 (Fig. 1). The amount of gas iscontrolled by bulb or thermally responsive element 26 located in thelower part of tank 3 directly under the outlet of cold water admissiontube l4 and operating through thermostat 21 (Fig. 1) so that whenevercold water is admitted into tank 3 or the water in the bottom of saidtank otherwise falls below the boiling point, the burner flameincreases. The dimensions of identical stacks 23 and 24 are such thatenough heat is communicated to the water in the upper part of the tankto keep it at the boiling temperature even though the water in the lowerpart of the tank is temporarily below the boiling point. This insuresthat some steam will be continuously generated in the upper part of tank3, the use and application of which will be described hereinafter. Whenthe water in the lower part of tank 3 is at the boiling point thermostat21 (Fig. 1) cuts down the burner flame. The bypass of thermostat 2! isadjusted for minimum flame, such that even when the burner is cut downthe necessary extent of boiling and steam evolution in the upper part oftank 3 will be maintained.

Up to this point the means described is for the purpose of maintaining avolume of water in tank 3, of maintaining at least the upper part ofthis water at boiling temperature, and of maintaining controlledevolution of steam therefrom. In the operation of the machine, apredetermined amount of water is abstracted from the upper part of tank3 when the machine is operated. The equipment for this purpose includescontainer 30 (Figs. 1, 2 and 4) located in the upper part of tank 3below water level I! and vented into the space above said water level bypipe 3|. Screw 29 secures pipe 3| to shell 4 of tank 3 (Fig. 2). Detailsof the mechanism by which container 30 is alternately filled from tank 3or discharged to a point external to said tank appear from Figs. 1, 3and 4. This comprises pipe 28 extending at one end into container 30(Figs. 1 and 4) and at the other end into extension 29 of valve 32. Theplunger 33 of said valve is of the combination slide and poppet type,the side wall fitting snugly bore 34 of valve 32 (Fig. 3), while thefrusto-conical surface 35 makes liquidtight contact with frustro-conicalseat 36. The plunger is actuated by push rod 31 operating throughstuffing box 33. When the plunger is in, the position shown in Fig. 3,container 30 (Figs. 2- and 4) is in free communication, via pipe 28,,with outlet 39 and the contents of container 30 flow out of tank 3.When, however, plunger 33 is in its lowest position, outlet 39 isblocked by the poppet valve consisting of surface 35 and seat 36,, nowin liquid-tight contact, whereupon water flows from the interior of tank3 through port 40' (Figs. 1 and 3) and through the bore 34 of valve 32back into container 30..

The dispenser 4| which delivers a predetermined amount of ground roastedcoffee is illus- 4 trated in Figs. 1, 2, 17 and 18. The dispensercomprises cylindrical bore 42 and integral therewith flange 43 and rim44 which hold glass cylinder 43. The cylinder is surmounted by theremovable cover 46. The bottom of cylindrical bore 42 is provided withfloor 41. Upstanding shaft 48 is journaled in the exact center of thisfloor. Pinned to this shaft is hub 49 which carries eight radiallydisposed vanes 50 (Figs. 2 and 17). These vanes define eight pockets(Fig. 2)

' which by their rotational movement operate to progressively bringcharges of coffee over discharge port 5| in floor 41,,(Fig. 18) Coverplate 52 (Figs. 2 and 17) secured to cylindrical bore 42 (Fig. 1'7)overlays port 5| to prevent coffee from running out of said port (Fig.18) except as transported by vanes 50 to a position overlaying saidport. To the upper part of shaft 48 there is pinned hub 55 (Figs. 2 and17) bearing three sweeps 56 which sweep the upper surface of cover plate52 to prevent accumulation of ground coffee thereon.

Dispenser 4| additionally requires some means for moving hub 49 andattached vanes 56. This means includes gear 59 (Figs. 17 and 18) splinedto the lower end of shaft 48. This gear is periodically engaged by ahook 6| journaled at 62 to arm 53 of bracket 64. Spring 6!) (Fig. 17)serves to impel said hook into contact with said gear. Bracket 64 borneby vertical shaft 65 is bored to loosely engage stub 66 secured in anddepending from floor 41 of the dispenser. As is evident from thisconstruction, when shaft 65 and bracket 64 carried thereby are moved inone direction, hub 49 will be carried through a fraction of a completerevolution, but when shaft 65 and therewith bracket 64 move in thereverse direction, hook 6| will merely slide over the beveled teeth ofgear 59 (Fig. 18) without moving hub 49 (Fig. 1'7). In practice, I findit highly advisable that this movement be carried out gradually andprogressively throughout the major part of the operating cycle of themachine. This being the case, it is evident that unless suitableprovision were made, the coffee in the pocket, formed by two of vanes55, moving over discharge port 5| (Figs. 2, 17 and 18) would fallcontinuously out through said discharge port. Inasmuch as the coffeemust however be discharged at the commencement of the operating cycle,suitable means is incorporated to hold. this charge of coffee in thedispenser until required. This means includes plate 10 (Figs. 6 and '7)pivoting about shaft 48 and slidable parallel to discharge port 5| touncover same. I-Iook T2 is journaled at '13 to arm 74 of horizontalbracket 64. When hook 6| reaches the position of maximum advance, thepocket defined by two of vanes 56 has been brought directly overdischarge port 5|. At this time slot 15 of hook 12 engages pin H onplate 16 and when horizontal bracket 64 and hook l2 actuated therebymove in the reverse direction plate, 13 slides to uncover discharge port5|. This uncovering is effected at a suitable time in the beginning ofthe machines cycle as will be hereinafter explained. When bracket 64commences to return, shoulder 16 (Fig. 18) of hook i2 is engaged by dogTl resiliently pivotable about pin 19 against the action of spring 13one end of which is connected to arm 8| of dog 1'! and the other to stub82 provided on the bottom of floor 4]. Hook T2 is thereby forced out ofengagement with pin TI and plate 70 returns to closed position, coveringport 5|, under the influence of spring 83, one end of which is connectedto pin 84 on arm 85 of plate I while the other end is connected to stud86 protruding downward from dispenser floor 41. The further movement ofbracket 64 forces dog 11 out of engagement with shoulder I6, therebyfreeing hook 12. Plate I0 is supported by rigid bar 89 pivotally carriedby the lower end of shaft 48.

Some of the finer grades of coffee manifest a tendency to stick togetherand may for this reason not be completely discharged from the spaceoverlaying port I even though plate I0 has uncovered said port. Thisdifficulty is, however, overcome by upwardly projecting teeth 90 and 9|(Fig. 17) carried by plate I0, which teeth project up into the spacetraversed by vanes 50 and rip and dislodge the coffee above dischargeport 5| so that it is fully discharged. A perspective view of one suchtooth is shown in Fig. 19. As is evident from Fig. 6, vanes 50 defineslots or cut-out portions 92 which enable vanes 50 to clear teeth 90, 9|in their progressive rotational movement.

The dispenser 4| is positioned by bracket 99 (Fig. 1) embracingcylindrical bore 42 of dispenser 4|, the ends of said bracket 99- beingsecured to shell 4 of tank 3 (Fig. l). The dispenser is thus firmlysecured in position in the machine.

That part of the machine by which the predetermined volume of coffeedelivered by dispenser 4I and the predetermined volume of waterabstracted from tank 3 are commingled to form a mixture of hot water andground roasted coffee appears in Figs. 1, 5 and 13. Referring to thesefigures, this part of the device comprises mixer I00 consisting of conebottom receptacle IOI surrounded by casing I02 and associated means foradmixing the coffee and water. Discharge outlet 5| of the dispenser islocated directly above the mouth of receptacle IOI so that the charge ofground roasted cofiee delivered by the dispenser falls directly intosaid receptacle. The predetermined volume of water abstracted from tank3 by means hereinabove described is delivered via valve 32 intoreceptacle IOI by spout I03 (Figs. 1, 5, 6 and 13). The hot water issuesfrom spout I03 in a well defined stream of considerable velocity throughorifice I04 (Figs. 5 and 6). This orifice may be threaded to the spoutso that orifices of difierent capacity may be substituted for oneanother if it is desired to change the volumetric capacity of themachine. As indicated in the drawing (Figs. 5, 6 and 13) this streamfrom orifice I04 is discharged at a non-central angle intermediatebetween vertical and horizontal and on striking the surface of theliquid already delivered into receptacle IOI it imparts a rotationalmovement thereto while simultaneously beating down into the liquid anyground coffee floating on the surface thereof. This angle is preferablybetween 30 and 60 with reference to the horizontal, for maximumefficiency. As a result the coffee and water introduced into receptacleIOI are thoroughly and efiiciently commingled by the velocity of thewater introduced and without resort to a mechanical mixing device.

Suitable means is provided for discharging the mixture from receptacleIOI after it has remained in the receptacle a suitable predeterminedperiod of time. This means comprises a valve of special and novelconstruction (Figs. 5 and 9). The mixer discharge outlet I05 iscentrally located in the cone bottom I00 of receptacle IOI (Fig. 5).This outlet may be closed by the frustro-conical end of poppet-type plugI01. Referring to Figure 9, it can be noted that plug I01 in turndefines a small outlet or discharge orifice I08 which may be closed byconical plug I09 secured to the lower end of push rod IIO. These partsare held in alignment by bore I I I formed in the upper end of plug I8'! in which bore push rod IIO reciprocates. The central portion of saidplug I0I is cut away leaving only two posts I I4, thus permitting freeaccess of the mixture of water and coffee to orifice I08. When the valveis in the position illustrated in Fig. 5, i. e., with push rod III] indepressed condition, discharge outlet I05 is blocked by plug I01 andorifice I08 is blocked by plug I09. In this position the mixture ofcoffee and water is of course held in receptacle IOI. At the expirationof a predetermined period of time a controlled and uniform stream of themixture is supplied to the centrifugal separator to be hereinafter morefully described. For this purpose, the pressure on push rod I10 isreleased whereupon spring II5 pressing against collar IIO pinned to rodIIO forces upwardly said rod and plug I00 carried thereby, therebyuncovering orifice I08. This position of the valve is shown in Fig. 9.The diameter of this orifice and of the rundown tube III (Fig. 5) areinterrelated. If the rundown tube is too small the requisite rate offiow cannot of course be maintained and conversely if it be too large itwill not carry a solid column of liquid, whereupon suction on orificeI08 will be lost and the rate of flow out of receptacle IOI will falloff rapidly with diminishing level of the material in receptacle IOI.Within these limits the rate of fiow from receptacle I01 is a functionof the total heighth of liquid in said receptacle and said rundown tubeII! and is therefore only limitedly affected by the drop in level inreceptacle I0 I.

For the purpose of establishing the diameter of the orifice and of theoutlet tube the following procedure is recommended. Having establishedthe dimensions of the mixing receptacle and the length of outlet tuberequired to carry the mixture from the receptacle into the base of thecentrifuge, an orifice is provided in the lower end of the outlet tube.Being so mounted the orifice will at all times be operating under a fullhead of liquid and the rate of flow will therefore be controlled by thesize of the orifice and by the head. Under these conditions, the size ofthe orifice can be varied until the desired rate of fiow out of themixing receptacle is obtained. In this way it is possible to establishapproximately the correct diameter of orifice, and the size of orificehaving been so established the orifice is now moved from the lower endof the outlet tube to the upper end of the outlet tube. Two proceduresare now available for determining the correct size of the outlet tube tobe operated in conjunction with the size of the orifice so established.In one procedure an outlet tube of transparent material such as glassmay be temporarily provided and tubes of varying diameter aresubstituted until with increasing diameter it is found that the tubewill not carry a solid column of liquid but that the column will breakand will at least partly displace the liquid in the tube, therebyreducing the hydrostatic head upon the orifice. The outlet tube to beadopted in practice should approach the maximum diameter at which asolid column of liquid is obtained under these conditions there- 'byinsuring a uniform discharge of the mixture from the mixing receptacleinto the centrifuge coupled with the maximum rate of discharge of theflush water hereinafter referred to. In the alternate procedure anoutlet tube of metal may be used and tubes of varying diametersubstituted until a diameter is reached at which the outflow from themixing receptacle through the orifice is not uniform and sustained butpro contra falls off sharply with the reduction of liquid level in themixing receptacle. Based on these observations the tube to be adoptedand installed should approach the maximum diameter at which the rate ofoutflow from the mixing receptacle is a function of the total headWithin the mixing receptacle and the outlet tube and is thereforerelatively unaffected by a reduction in liquid level within the mixingreceptacle.

At the complete end of the operating cycle it has been found necessaryto flush out receptacle IOI and at this time and for this purposesquirts of water are tangentially introduced (Figs. 5 and 13) by nozzlesII8. These nozzles are bored in small turrets II9 spun into the imiersurface of the side wall of receptacle IOI. A detail View of one suchnozzle is shown in Fig. 8. Flush water is carried to said nozzles byannular ring I20 set in the top of mixer I (Fig. and the flush water iscarried into ring I by tube I2I (Figs. 1 and 5). The means for thesupply of flush water to tube I2I is described hereinbelow. During thisstage of the operating cycle free discharge from receptacle IN isdesirable and this is accomplished by further lifting push rod H0 sothat plug I0! is unseated and the liquid passes out of receptacle I0|through the full opening of discharge outlet I05 (Fig. 5)

Inasmuch as tramp material'occasionally finds its way into the dispenserand s nce such tramp material might plug orifice I08 and thereby disturbthe working of the machine, said orifice is surrounded byfrustro-conical screen I22 (Fig. 5) This screen is of perforated metal,the perforations being approximately %th inch in diameter on inchcenters. It operates to prevent tramp material finding its way toorifice I03 and also functions as a guide surface for plug I 01.

The construction of the centrifugal separator and ancillary parts isshown in Figs. 5, '7, 10, 11 and 12. The centrifuge I23 (Fig. 5)preferably of chromium steel or stainless steel, comprises upper tubularsection I24 which terminates in inwardly projecting overflow lip I andlower tubular section I26 of a diameter greater than section I24. Thelower end I26 of centrifuge I23 is spanned by the annular closure I 21carrying the centrally located discharge tube I28. It has been found inpractice that the larger particles in the coffee grind are quicklythrown out in the base of the centrifuge and tend to accumulate at thispoint, but that if the the centrifuge is made uniformly large enough indiameter to accommodate this accumulation, the peripheral velocity ofdischarge from the overflow lip is so great as to introduce cloud intothe beverage. By the special form of centrifuge shown in Fig. 5, theaccumulation in the base of the centrifuge is provided for and anytendency to plug as the result of the use of too coarse a grind isobviated, while the upper tubular section I24 of the centrifuge is freedof the load of the coarser particles and a higher clarificationefliciency'is maintained with minimum peripheral velocity of dischargeand minimum cloud. In practice, the centrifuge is started in rotation sothat it comes to full speed before plug I09 lifts and orifice I08 isuncovered. Thereafter the mixture of grounds and extract runs at auniform rate through mixer outlet I05 to tube II I and is divertedhorizontally from the lower end of tube I I! by spinning saucer I30.

Referring to Figs. 10, 11 and 12' for details of this saucer, it can benoted that the circumference of this saucer is provided with a series ofvertical teeth I31. These teeth act as an impeller ring to increase thevelocity with which the mixture of ground coffee and water issuing fromoutlet tube II'! is thrown horizontally into lower tubular portion I26of centrifuge I23. In order to prevent coffee grounds from beingretained in said saucer by the inner surfaces of said teeth, saidsurfaces are inclined downwards, preferably forming a continuation ofthe radial bevel of said saucer, and may in addition also be providedwith lateral bevels as shown in the drawing (Figs. 11 and 12). SaucerI30 is carried by two posts I3I (Fig. 10) forming an upward extension ofdischarge tube I28, thus leaving a full opening for discharge purposes.The mixture undergoing separation accumulates in the centrifuge intubular form. The thickness of this tubular body is determined by theinner edge of overflow lip I25. As stated, the larger particles arethrown out in lower tubular section I26 of centrifuge I23 and withcontinued introduction of fresh mixture the partially separated mixtureis displaced upwardly into upper tubular section I24 of the centrifuge.The mixture introduced into the centrifuge may contain some froth andsome particles which have associated air or gas bubbles. Such froth andparticles might move up along the inner wall of the centrifugal columnof liquid but are restrained from so doing by a series of, for instance,four baffles I35 provided in upper tubular section I24 of the centrifuge(Fig. 5). Referring to Figure 7 for a detail view of one of thesebaflles it is noted that they are peripherally cut away to formconcentric slots I36 through which the mixture passes adjacent the innerwall of upper centrifuge section I 24, and are provided with centralopening I3! to clear rundown tube II! (Fig. 5), but are otherwiseimperforate so that material cannot flow telescopically up thecentrifuge. The bafiles are secured in position in any suitable manner.When centrifuge I23 is placed out of rotation (by means hereinafter tobe described) the coffee grounds discharge by gravity into dischargetube I28 and thence into waste pipe I33 (Fig. 5). Waste pipe I33 issupported from base I by fitting I34 (Figs. 1 and 5). The centrifuge isdriven by motor I92 through belt I39 (Fig. 1) and pulley I40 (Fig. 5).

As mixture continues to flow into centrifuge I23 there is a continuousupward displacement of same into upper tubular portion I24 of thecentrifuge and clarified beverage is thrown off from the top surface ofoverflow lip I25. It will be noted (Fig. 5) that the outer peripheraldiameter of lip I25 is less than the bore of the upper portion I 24 ofthe centrifuge, thereby reducing the peripheral velocity of discharge.Thev clarified beverage is caught in the annular trough formed bycollector ring I 4| (Fig. 5). This collector ring is provided with bossI42 by which it is secured to cylindrical casing I43. By reference tothe partial view of collector ring I contained in Fig. 15, it will benoted that the beverage discharges from said collector ring through bossI42 into accumulator I44 by means of spout I45. This spout debauchesinto thimble I46, forming a hydrostatic seal, the function of which willbe hereinafter considered.

Accumulator I44 (Figs. 1, 2, 13, 14 and 15) 9 comprises spacedconcentric glass cylinders I41 and I48 (Fig. 14) closed by top andbottom end plates I49 and I50, respectively, held together by rods II.Faucet I52 (Figs. 1, 2 and 13) is provided for drawing oif the coffeebeverage. Bracket |53 (Fig. 14.) extends downwards from end plate I49 tosupport thimble I46. Cover plate I54 (Fig. 13) slidable parallel to topend plate I49 provides access to the accumulator for cleaning purposes.Float I55 vertically displaceable in housing I56 (Fig. 14) is responsiveto the liquid level within said accumulator. This float is provided withvertical guide pin I51, rigidly attached thereto. The operation of thisfloat can be more easily understood by referring to the partialcross-sectional view afforded by Fig. 16. When the level of coffeebeverage in accumulator I44 drops below the predetermined level, floatI55 and vertical guide pin I51 rigidly attached thereto (Fig. 14) movedownwards and collar I58 I Fig. 16) borne by pin I51 (Figs. 13 and 16)presses down on end I59 of channel member I30 (Fig. 16) pivoted aboutpin I6I secured in housing I62. End I63 of said channel member is thusraised, closing microswitch I64 (Fig. 1) by means of chain I35 (Figs. 1and 16), thus maintaining the electrical circuit of my machine closed,'

as will be described hereinafter below. When coffee beverage hasaccumulated up to the predetermined level in accumulator I44 float I55rises, the pressure on end I63 of lever I60 is released and microswitchI64 is allowed to open. Cam I56 (Figs. 13 and 16) is arranged in housingI62 and provided with handle I31 to turn said cam to cause it to beardown on lever end I63, thus providing manual operating means for thecontrol of microswitch I64 (Fig. 1).

Centrifuge I23 is journaled in bearing I69 (Fig. 5). This bearingdefines annular space I10, closed by annularring I68, into which spaceoil for lubrication is introduced through oil hole I1I connecting withforce-feed lubrication line I12. The oil moves to the bearing surfacethrough hole I13. Any oil thrown off from the upper surface of bearingI69 is deflected by apron I14 into annular trough I15, from which itdischarges through port I16 onto shelf I11 secured to the side wall ofthe centrifuge and serving to deflect the oil into annular trough I18.Similarly any oil passing away from the lower surface,

of bearing I59 is likewise deflected by said shelf I11 into said annulartrough I18. Overflow I8I communicating with said trough serves to returnthe oil via line I82 to the oil reservoir 351 (Fig. 1) to be hereinafterdescribed. The downward thrust of the centrifuge is taken by collar I83(Fig. 5) secured to the side wall of the centrifuge and riding on theupper surface of bearing I69. This collar also carries depending skirtI84, the purpose of which will be hereinafter described.

After the mixture formed in receptacle IOI has all flowed intocentrifuge I23, a batch of plain water at about the boiling point fromtank 3 is delivered by valve 32 into receptacle IOI through spout I93.This water flows into centrifuge I23, thereby displacing any extractremaining therein at this time, and insuring that when the centrifuge isstopped, it will not contain beverage coffee and that there will not bea loss of yield as the result of beverage remaining in the centrifuge.

When these operations are concluded, centrifuge I23 is abruptly stoppedby means of brake 301 (Fig. 1) to be hereinafter described. In this casethe residue of grounds and water remaining in the centrifuge continuesto rotate for a few seconds until its momentum has become dissipated.This scours and cleans the inner surface of centrifuge I23 and as soonas the momentum has been dissipated in this manner the mixture flows outof the centrifuge through discharge tube I28 and out of the apparatusthrough waste pipe I33.

As soon as this has taken place, jets of hot water are dischargedagainst the inner walls of receptacle IOI and of centrifuge I23 therebycompleting the cleaning operation. 7

The means for the accomplishment of this cleaning operation comprisescoil I surrounding flue 2! in tank 3 (Figs. 1, 4 and 13) and branchingoff from water inlet pipe I0 below needle valve I3. The other end ofcoil I90 communicates via flush control'valve I9I (Figs. 1, 2, 4, 5 and13) with pipe I93. Pipe I93 communicates in turn with conduit I94 (Fig.5) within casing I02 of mixer I06, which conduit termi-v nates inchamber I91 concentrically arranged about mixer discharge outlet I05 anddelivery tube II1. Flush tube I96 extends downwards from chamber I91, soas to provide an annular space concentrically surrounding rundown tubeII 1. This annular space is sealed off slightly above teeth I32 ofsaucer I30, and flush tube I96 is provided with a multiplicity oforifices I93 forming outlets for the flush water. Tube I2I providingflush water via nozzles II3 to receptacle IOI, as described above,branches oiT from pipe I93. This tube is provided with U-bend I99 toprovide a hydrostatic seal in said tube. Thus when flush control valveI9I (Figs. 1, 4 and 13) is actuated by means hereinafter to bedescribed, water which has been heated in coil I90 to 100?. C. and whichis under the full pressure of the main water supply, for instance themunicipal water system, discharges through orifices I98 and nozzles H8(Fig. 5) thereby flushing out receptacle IOI and centrifuge I23respectively.

As hereinbefore stated, burner 22 (Figs. 1 and 4) heating the water intank 3 is so controlled, thermostatically, that some boiling is alwaystaking place in the upper part of tank 3 with consequent generation andevolution of steam. This steam passes downwardly through vertical pipe20I (Figs. 1, 2 and 13) and thence via horizontal pipe 202 into casingI32 (Figs. 2, 5 and 13) Some of the steam condenses to maintainreceptacle IOI, centrifuge I23, collector ring MI and associated parts(Fig. 5) at 100 C. thereby insuring efflcient operation regardless ofthe standby periods and also sterilizing centrifuge I23 and collectorring I4I. One part of the excess steam moves downwardly through the boreof centrifuge I23 and out of the apparatus through discharge tube I28and waste pipe I33 (Fig. 5). Anyair that may have been originally in thecentrifuge or carried into it from the mixture theretofore separated isthus displaced by steam, thereby eliminating cloud in the finishedbeverage which would otherwise result from air in the system. The steamis prevented from flowing into the centrifuge bearings by dependingskirt I84 (Fig. 5), which operates as a hydrostatic seal, the water forthis seal being supplied by the condensation effected at casings I02 andI43. Whenevercentrifuge I23 is started this water is thrown out bycentrifugal force and flows through drain 204 and conduit 205 to Wastepipe I33. Another part of the excess steam passes via conduit 206 (Figs.5 and 15) into the annular space defined by glass cylinders I41 and MBof accumulator. I44 (Fig.

15),.thusproviding a steam jacket'for the coffee beverage containedwithin said accumulator. Condens'ate'flows to waste pipe I33 throughdrain 208 '(Fig. '14) and'pipe 255 (Fig. '5). The hydrostaticseai'provided by thimble I55 (Figs. 14 and '15) prevents steam passinginto the central portion of accumulator I44 through spout I45.

Having described the constituent parts of the m'achine'by which thebeverage is produced I now describe the controlor timer by which theseconstituent parts are operated in the correct temporal sequence. Thetimer 220 (Figs. 1 and -24) comprises pulley 22I driving, through threereduction gears (not shown in the drawing) contained in reduction gearhousing 222, worm 223 which in turn drives gear 224 splined ontojackshaft'226. Pulley 22I is driven by V-belt 225 frommotor 221 (Fig. 1)Referring to Figs. 20-24, jackshaft 226 carries seven cams by which thesaid-temporal sequence is determined which cams will b'ehereinafter moreparticularly described. Said jackshaft 226 is journaled in holes boredin theuprights 228 and 229, which in turn are suspended from theunderside of base I (Fig. 1). These uprights are mounted on reservoircover plate-362, and are further laterally supported by cross-plates H6and 2H. Motor 221 is carried laterally *by cross-member 230 secured tolegs 2 (Fig. 1). Cam rider shaft 23I is likewise journa'led in holesbored in uprights 228 and 229. Shaft 232 is secured in brackets 231supported on vertical panel 233, this shaft serving as pivot for mercuryswitches 234 and 235 the purpose of which is hereinafter explained.Panel 233 is out out to permit the pivoting of these switches. Trough236 is supported by staybolts 2 l 8 and 2 I 0 secured between uprights228 and 229. This trough (Figs. 1 and 20-24) functions to retain a bathof oil or grease into which the cams dip and which, therefore, providesthem with adequate lubrication.

Jackshaft 226 is so geared to timer motor 221 that it and the camscarried thereby make a complete revolution in one cycle of theapparatus. The construction of the cams will be described by referenceto one specific embodiment of the apparatus which has a cycle time of 90seconds. In this specific embodiment, centrifuge I23 (Fig. 5) has anoverall inside length of thirteen inches. The inside diameter of thebase portion I26 is three inches, inside height of this portion two andthree-sixteenths inches, inside diameter of upper portion I26 of thecentrifuge one and one-half inches, inside diameter of the overflow lipI one inch. Rundown tube H1 is of th inch bore and orifice I08 of plugI01 is of gth inch bore. This centrifuge is operated successfully atabout 5000 R. P. M. with an output of five cups of finished beverage percycle. The centrifuge may, of course, be operated at higher or lowerspeeds, if desired, and the output per cycle may be increased ordecreased, depending upon the strength desired. With the cycle time andcycle output described, the amount of coffee introduced may be in theproportion of one pound of coffee to about cups of finished beverage orabout one pound of coffee to about cups of finished beverage, or in anyintermediate proportion.

We are now prepared to discuss the specific designs of the cams and camriders whereby the requisite control is obtained. Referring to Figs. 20,21, 24 and especially 33, the function of cam 240 is to "maintain theprecise cycle time of the apparatus and to insure that whenever startedin'operation, it will continue to operate until its full cycle iscompleted. Rider 24I is pivotally carried by shaft 231 while projection243 rides on the surface 244 of cam 240. Rider 24I is connected throughlink 245 to rocker 245 pivotally carried by shaft 232. Rocker 246carries mercury switch 234. By reference to Fig. 36 which is a diagramof the wiring circuit, it is seen that mercury switch 234 is in serieswith timer motor 221. Thus, whenever timer motor 221 is started inoperation, as by the microswitch I64 controlled manually or byaccumulator float I55, and hence projection 243 climbs from surface 242onto surface 244, mercury switch 234 will 'be carried to the on-circuitposition and motor 221 will continue in operation until the entire cyclehas been completed and the cam rider MI is returned again down ontosurface 2 42 by the tension of spring 241. One end of said spring isconnected to rocker 246 and the other end to panel 233. At this point ifswitch I64 (Figs. 1 and 36) is open, timer motor 221 and the apparatuscome to a complete stop.

The next step in the operation of the apparatus'is effected by 'cam 249(Figs. 20-24). A detail view of this cam is shown in Fig. 26. This 'camcarried by j ackshaft 226 controls the operation of the mixer outletvalve I05 shown in Figs. 5 and 9. When timer motor 221 is startedprojection 250 of rider 25I carried by shaft 23! climbs to the surface252 of cam 249, thereby lifting push rod 2 53. This push rod isconnected via link 254 (Fig. l) pivoted on bracket 255 secured to baseI, with rod 248. Arm 256 extends horizontally from rod 248, its outerend being 'displaceable between-collars 251 and 258 on push rod H0 (Fig.1). Thus when push rod 253 is lifted, arm 256 is depressed and strikescollar -258, thereby pressing downwardly upon push rod 'I:I0 and'seatingplug I09 in orifice I08 (Fig. 5). Projection 250 will be about half-wayup the inclined surface of cam 249 when projection 243 (Fig. 35) attainsits full lift. This insures that the load on timer motor 221 will bestaggered and that mixer outlet valve I05 will not be fully closed untilthe machine cycle has been definitely started. At the expiration of 42seconds from the time of initial contact projection 250 runs off surface252 (Fig. 26) onto surface 259 by reason of the pull exerted by spring260 connected between rider 25I and oil reservoir cover plate 362. Inthis way pressure on collar 259 (Figs. 1 and 5) is relieved and orificeI08 is permitted to be opened by the upward pressure of spring II'5operating against collar II6 (Fig. 5). At 83 seconds after the time ofinitial contact, projection 250 runs off surface 259 (Fig. 26) ontosurface26l. The further drop in push rod 253 causes arm 256 (Fig. '1) tocontact with and lift collar 251, thereby lifting the entire valveassembly I01 off of seat I05 and making available the full dischargeopening from the bottom of receptacle IOI.

Returning to Figs. 20:24, the next cam in point of interest is 265. Adetail view of this cam is shown in Fig. 29. This cam controls theoperation of the mixer water inlet valve 32 shown in Fig. 1. Whenprojection 250 (Fig. 26) has just attained its maximum lift, projection266 (Fig. 29) of rider 261 carried by shaft 23!, is about half-way upthe surface 268 of cam 265.

Projection 266 continues to ride on surface 268 until 20 seconds afterthe time of initial contact, whereupon projection 266 is returned tosurface 269 by the pull exerted by spring 264. While from the dispenser.

13 projection 266 was in the elevated position, push rod 21! was lifted,thereby lifting connected yoke 212 (Fig. l) and opening valve 32 (Fig.13). In

a machine of the specific capacity described,

orifice !04 (Fig. 5) is so chosen that approximately five cups of waterpass into receptacle !9! during the period that valve 32 is so opened.At the expiration of 20 seconds, valve 32 is closed by the return ofpush rod 21! and remains closed until 57 seconds after initial contactwhen projection 286 runs up onto surface 213 (Fig. 29) of cam 265. Itcontinues to ride on this surface 213 until 67 seconds after the time ofinitial contact, whereupon projection 266 runs down onto surface 214 andvalve 32 is again closed. From 2.5 to 3 cups'of water will haveentered-receptacle l! during this period.

Having described the means for closing the mixer outlet valve and forintroducing the water. it is now in order to describe the means forintroducing the ground coffee.

I have already described the dispenser (Figs. 1, l7 and 18) and how by amovement of rod 65 and bracket 54 in one direction the hub 49 was turnedduring one operating cycle and how by the reverse movement of rod 65 andbracket 64 at the commencement of a succeeding cycle the bottom closureplate 18 was moved horizontally to uncover dispenser discharge outletthereby dropping a batch of coffee into receptacle !5!. These operationsare controlled by cam 289 (Figs. 29-24). A detail view of this camappears in Fig. 30. Roller 28! of rider 282 pivotally mounted on shaft23! runs on surface 233 of cam 280. Rider 282 is provided with bell arm286 the outer end of which is developed as yoke 28'! (Fig. 31) to holdpin 288 on which double clevis 289 is pivoted. Shaft 65 extendingthrough an orifice in base I (Figs. 1 and 30) and secured therebyagainst translational movement is pivotally connected to said clevis 289by yoke arm 29!] (Figs. 30 and 31). During the operation of the machine,roller 28! is progressively lifted by surface 283 thereby forcing link289 in the direction indicated by arrow 284. The effect is to move arm29!] and rod 65 through an angle of about 60. It is this movement which(Figs. 17 and 18) turns the hub 49 of the dispenser. The actualrotational movement of the wheel is only 45; the overrun of isdesirable, however, to make certain that hooks 6! and 12 (Fig. 18) makeproper engagement respectively with gear 59 and pin H. At the expirationof a machine cycle, cam 28!) and rider 282 are in the positionsindicated in Fig. 30. When a machine cycle is started, roller 28! runsdown surface 29! of cam 28!]. This obviously permits clevis 289 to moveunder the action of spring 285 (Fig. 1) (one end of which is connectedto shaft 65 and the other to base I) in the reverse direction to thatindicated by arrow 284. The corresponding movement of rod 65 (Figs. 1,17 and 18) operating through bracket 64 moves hook 6! to the positionshown in Fig. 18, thereby opening bottom closure plate Ill and droppinga charge of coffee This operation takes place after mixer outlet )5(Fig. 5') has been fully closed and before the water from orifice I04has been fully discharged so that the continued discharge of this watermay operate to drive the coffee below the surface of the wateraccumulated in receptacle I!!! and to insure complete mixing. Ashereinbefore pointed out the movement of rod 65 caused by theprogressive lift of roller 28! also operates to throw hook 12 out ofactuates valve stem engagement with pin I! (Fig. 18), thereby permittingthe pull exerted by spring 83 to close door 19.

Cam 390 (Figs. 20-24), next to be considered, controls the operation ofcentrifuge motor 292. This motor operating through pulley 293 drivespulley I40 (Figs. 1 and 5) of centrifuge !23 via V-belt I39. For thispurpose motor 292 is secured to lag 2 of base (Fig. 1). Referring toFig. 28, jackshaft 226 carries cam 390. Cam rider 39! pivotally mountedon rod 23! has projection 382 which rides on the surface of this cam.Rider 38! is connected through link 394 to rocker 385 pivotally carriedby shaft 232. Rocker 335 carries mercury switch 235. As proiection 382rides up onto the elevated portion 383 of this surface, link 394 changesthe angle of rocker 385, thereby throwing mercury switch 235 carriedthereby to the on-position. As is evident from the wiring diagram ofFig. 36, this switch is in series with and controls centrifuge motor292. To bell arm 398 (Fig. 28) of rider 39! there is pivoted link 3! 4,the other end of which is pivoted about pin 3H5 provided in yoke 3!5 ofbrake drum 39? (Figs. 24 and 28). Before switch 235 reaches theon-position, link 3!4 is retracted, thereby pulling brake drum 30'! andbrake surface 388 away from engagement with the outside of lower sectionof centrifuge !23 (Fig. 1). As shown in Figs. 22-24 brake drum 381 isslidably carried by rods 309 and 3!!) mounted in uprights 228 and 229.Springs 3!! and 312 urge brake drum 38'! toward lower section I23 ofcentrifuge 23 and as soon as projection 352 rides off of the elevatedsurface 383 these springs apply the brake and arrest the rotation of thecentrifuge; simultaneously spring 3l3 connected between rocker 395 andpanel 233 returns mercury switch 235 to the offposition, thereby killingcentrifuge motor 292.

After centrifuge motor 292 and centrifuge !23 have stopped, sufiicienttime is allowed for the material remaining in the centrifuge to lose itsrotational movement and run out of the device through discharge tube I28and waste pipe l33 (Fig. 5). Shortly thereafter receptacle HM andcentrifuge I23 are flushed out through spray nozzles H3 and orifices l98(Fig. 5) and for this purpose flush control valve I9i is actuated bypushing upwardly valve stem !92 (Fig. 1). To this end push rod 329 (Fig.l) is forced upwardly so that collar 32! borne by the end thereof israised from its seat on top of sleeve 322 and 192. The mechanism bywhich this is accomplished is shown in Figs. 32 and 33 in a detailshowing of part of the construction of Figs. 1 and 20-24. Cam 338mounted on shaft 226 defines a discontinued surface of progressivelyincreasing radius. As the cam revolves, during the machine cycle, itprogressively forces upward lever 33! pivotally connected to spacer 328on the side of upright 229 (Figs. 21, 23 and 32) by pin 332. This upwardmovement compresses coil spring 333 positioned by retainers 346 and 34';against lever 334 which is also pivotally connected to said spacer 328by pin 335. Attention is called to the fact that the pivot points oflevers 331 and 334 do not lie in the same vertical plane (Fig. 32).Lever 334 cannot move upwardly because it is restrained by trigger 333pivotally connected to spacer 329 on the side of upright 229 (Figs. 20and 21) by pin 33?. At the exact moment at which it is desiredto'actuate the fiush valve, trigger 333 is forced off of the end oflever 334 by pin 338, thereby releasing lever 334 and actuating push rod320.

The angular divergence between levers 334 and 33I is, however, limitedby roller 339 rotatably supported by pin 349 in oversize bore 34I. Leafspring 342 tends to hold roller 339 in the position shown in Fig. 34.Housing 343 carried by lever 33I supports pin 340 and spring 243. Assoon as the end of lever 33I runs off of the elevated surface 344 of cam330 both levers 33S and 334 drop and flush control valve I9! is therebyclosed, and upon further rotation of cam 330 trigger 336 is reset bymeans of spring 345 attached between said trigger and stub 346. As theresult of this construction the flush valve is either fully on or fullyoff, i. e., there is no intermediate period in which water is beingdischarged without a vigorous flushing effect and the total time thevalve is open may be closely determined by adjustment.

Next to be considered is the force-feed lubrication system for thecentrifuge bearings. Referring to Fig. 27, cam rider 359 pivotallycarried by shaft 23I has projection 35I which rides on the surface ofcam 352, mounted on shaft 225. The rotational movement of cam 352operating thlrough link 353 alternately raises oil pump piston 354. Thereverse movement of piston 354 is effected by spring 356. As can benoted from Fig. 27, there are four strokes of piston 354 during eachmachine cycle. These movements discharge oil from reservoir 35! throughside outlet 360 and tube I12 (Fig. 1) into annular space I?!) (Fig. inthe upper surface of centrifuge bearing I69. Oil returns to reservoir351 from annular trough I19 (Fig. 5) through return line I82 (Fig. 1).Oil reservoir cover plate 362 is supported from base I by uprights 228and 229 (Figs. 20-24), and reservoir 35'! is suitably secured to thebottom of said cover plate.

Referring to Fig. 25 for a longitudinal vertical section through oilreservoir 35'! and cover plate 362, the reservoir may be periodicallyreplenished through fill pipe 363. The reservoir is provided with ariser 365 which is connected by duct 366 with the main body of reservoir351. If water finds its way into the oil reservoir, as, for example, theresult of leakage, carelessness in cleaning, or possibly leakage ofsteam into the main bearings, the water accumulates in the lower part ofreservoir 35] and the oil is thereby lifted into risers 368 and 370until the compound head of thewater and of the oil resting thereoncounterbalances the hydrostatic head of a column of water in riser 355extending up to outlet 354. Any further accumulation of water is thenautomatically rejected through outlet 354 without at any timeinterfering with normal bearing lubrication. Piston 354 reciprocates inliner 369 provided in pump block 3', said liner extending upwardsthrough riser 363 (Fig. 25).

The cams illustrated are of suitable outline for a ccfiee makeroperating on an overall 90 second cycle with a production of 5 cups offinished beverage per cycle. The following are the approximate timesmaintained by a timer carrying such cams and which times have been foundentirely satisfactory.

Seconds after Commencement of Cycle 0 Mercury switch 234 and timer motorDetermined by projection 243 riding up onto surface .244 of cam 240(Fig.35).

Seconds after Commencement of Cycle 5 (a) Mixer Discharge Outlet I05closes:

Determined by projection 259 riding up onto surface 252 of cam 249 (Fig.26). (b) Mixer Inlet Valve 32 opens:

Determined by projection 266 riding up onto elevated surface 268 of cam265 (Fig. 29). 8 Dispenser Outlet Plate I0 opens: Determined by roller28I running down surface 29I of cam 280 (Fig. 30). Dispenser OutletPlate I0 closes:

Determined by roller ZBI running onto a surface 283 of cam 289 (Fig.30). Mixer inlet valve 32 closes:

Determined by projection 266 riding down off elevated surface 238 onto asurface 269 of cam 265 (Fig. 29). Mercury switch 235 and centrifugemotor 292 on:

Determined by projection 302 running up on elevated surface 303 of cam399 (Fig. 28). Mixer outlet orifice I98 (Fig. 9) opens:

Determined by projection 250 running off of elevated surface 252 ontosurface 259 of cam 249 (Fig. 26). Mixer inlet valve 32 opens:

Determined by projection 266 riding up onto elevated surface 213 of cam265 (Fi 29). Mixer inlet valve 32 closes:

Determined by projection 266 riding down onto surface 214 of cam 265(Fig. 29). Mercury switch 235 and centrifuge motor 292 off and brake 30!applied:

Determined by projection 302 running off of elevated surface 393 of cam390 (Fig. 28). Mixer discharge outlet I05 opens:

Determined by projection 250 running off of surface 259 onto surface 26Iof cam 249 (Fig. 26). Flush valve I9I opens:

Determined by pin 338 of cam 330 releasing lever 334 from engagementwith trigger 336 (Fig. 32). (a) Flush valve I9I closes:

Determined by lever '33] running down off of elevated surface 344 of cam.330 (Fig. 32) (b) Mercury switch 234 and timer motor 221 off:

Determined by projection 243 running off of surface 244 down ontosurface 242 of cam 240 (Fig. 35).

The times for the actuation of oil pump 355 are .not critical. It is,however, desirable-to introduce the first slug of oil before centrifugemotor 292 is started.

The operation of my improved coffee maker will be evident from theforegoing description. As soon as the machine is up to temperature whichwill be evident from the appearance of steam at t-e waste pipe I33 (Fig.5) thereby showing that the water in tank 3 is up to the boiling pointand that the centrifuge is at a temperature of 100 0., the machine isready to operate. The

dispenser should be charged with ground coffee and for this purpose arelatively fine grind of the order of a corn-meal grind will be foundsatisfactory. The machine will continue to operate so long as thecircuit controlling timer motor 22'! is energized by float or manuallycontrolled microswitch 104 (Fig. 36). The residue of coffee groundsrejected from waste pipe 133 may be discharged in any suitable manner.The preferred practice in this regard is to drop the effiuent di rectlyinto a waste pipe communicatin with the sewer.

The foregoing description is furnished by way of illustration and not oflimitation, and it is, therefore, my intention that the invention belimited only by the appended claims or their equivalents wherein I haveattempted to claim broadly all inherent novelty.

I claim:

1. In a cofiee maker comprising a vertically disposed centrifuge of theimperforate overflow self-dumping type adapted to maintain a tubularbody of liquid in said. centrifuge uring rotation, a receptacle, arundown tube extending from said receptacle into said centrifuge, adispenser sur mounting said receptacle, a timer, means controlled bysaid timer for introducing a predetermined amount of water and meanscontrolled by said timer for transferring a predetermined charge ofground roasted coiiee from said dispenser into said receptacle, meansfor comingling said predetermined amount of water with said coffee insaid receptacle to form a mixture, the improvement consisting in thatsaid centrifuge is divided into an upper and a lower tubular section,said upper section being of lesser diameter than the lower section, saidupper section terminating in an inwardly projecting overflow lip, saidlower section having a centrifugal volumetric capacity at least equal tothe volume of said charge and carrying centrally and axially posi tioneda downwardly projecting discharge outlet defining a discharge opening oflesser diameter than the inside diameter of said overflow lip.

2. In a coifee maker comprising a vertically disposed centrifuge of theimperforate overflow self-dumping type adapted to maintain a tubularbody of liquid in said centrifuge during rotation, a receptacle, arundown tube extending from said receptacle into said centrifuge, adispenser surmounting said receptacle, a timer, means controlled by saidtimer for introducing a predetermined amount of water and meanscontrolled by said timer for transferring a predetemined charge ofground roasted coffee from said dispenser into said receptacle, meansfor comingling said predetermined amount of waterwith said coffee insaid receptacle to form a mixture, the improvement consisting in thatsaid centrifuge is divided into an upper and a lower t ular section, acup-shaped member surrounding the lower end of said rundown tube withinsaid lower tubular section, said upper section being of lesser diameterthan the lower section, said upper section terminating in an inwardlyprojecting overflow lip, said lower section having a centrifugalvolumetric capacity at least equal to the volume of said charge andcarrying centrally and axially positioned a downwardly projectingdischarge outlet defining a discharge opening of lesser diamter than theinside diameter of said overflow lip.

3. A coiiee maker according to claim 2 in which said cup-shaped memberis substantially symmetrical with respect to the top and bottom of saidlower section.

4. A coffee maker according to claim 2 in which said cup-shaped memberis provided with vertical teeth. 4

5. A coffee maker according to claim 2 in which said cup-shaped memberis provided with vertical teeth, the inner surface of which teethincline inwardly and downwardly through the interior of said cup-shapedmember.

LOUIS BURGESS.

CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 366,483 Howell et a1. July 12,1887 445,066 Laval Jan. 20, 1891 501,040 Berrigan July 4, 1893 795,424Bailey July 25, 1905 945,903 Bailey Jan. 11, 1910 992,809 Sanford et alMay 2-3, 1911 2,083,809 Asch June 15, 1937 2,149,270 Burgess Mar. 7,1939 2,263,095 Lieberman Nov. 18, 1941 FOREIGN PATENTS Number CountryDate 340,984 Germany Sept. 23, 1921

